Abstract
This paper describes the impact of two exhaust aftertreatment devices, an oxidation catalytic converter and a diesel particulate lter, on the particulate emissions of a heavy-duty diesel engine, the emphasis being on diesel particulate composition and size distribution. The analysis showed that the catalytic converter did not alter the size distribution signi cantly, except for an increased production of nanosized particles below 30 n miles in mean diameter. On the other hand, the ceramic monolith wall- ow lter reduced the emitted particle number up to 100 times. The results again indicated that a diesel particulate lter can also increase the number of nanosizedparticles. Further investigations, however, revealed that the formation of nanosized particles downstream of the oxidation catalytic converters and diesel particulate lters, respectively, is biased by inadequate sampling conditions.As long as realistic sampling conditions are applied, both catalyst and lter reduce particle emissions over the entire size range.
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